About the Authors

Young-Chool Choi

Chungbuk National University, Cheongju City, Korea, Sangmyung University, Cheonan City, Korea

Ji-Hyun Jang

Chungbuk National University, Cheongju City, Korea, Sangmyung University, Cheonan City, Korea

Corresponding Author

Email: ycchoi@cbu.ac.kr